Unread news can become overlooked (10)

I believe the answer is:

unanswered

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'overlooked' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?

'unread news can' is the wordplay.
'can' indicates an anagram (I've seen 'canned' mean this (canned can mean drunk)).
'unread'+'news'='unreadnews'
'unreadnews' anagrammed gives 'UNANSWERED'.

'become' acts as a link.

Can you help me to learn more?

(Another definition for unanswered that I've seen is " Not responded to".)

I've seen this clue in the Sydney Morning Herald.

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